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Q.

A body is projected vertically up with certain velocity. The ratio of velocity of projection to velocity at a point in its path is 6:5. The ratio of potential to kinetic energies at that point is

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a

9:25       

b

1:4

c

11:36

d

11:25

answer is D.

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Detailed Solution

uv=65⇒u2v2=3625

K. E at that point = 2536×  Initial K.E

P. E at that point = (1−2536)×  initial K.E

= 1136×KEi

PEKE=11362536=11:25

                               

               

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